DK9600130U3 - Retractable brake or support foot, especially for a trolley, mail container or similar transport device with drive wheels - Google Patents

Description

DK 96 00130 U3

DESCRIPTION

Denominations

Retractable brake or support foot, especially for a trolley, mail container or similar conveyor equipped with drive wheels.

Scope of production

This provision relates to a retractable brake or support foot, in particular for a carriage, post container or similar transport device of the kind provided with running wheels. More specifically, the support foot consists of an upper part which is fixedly mounted on the underside of the conveying device and a lower part retractable in the upper part of a spring device, which at its lower free end is provided with a frictionally stable brake shoe (machine shoe) for repulsion against the substrate. For activation-ie pulling-down of the support foot, this is equipped with a knee joint mechanism with bistable holding function. The brake / support foot is foot operated and the brake actuation is effected by pushing a brake actuating pedal for that purpose, which affects the slidable lower part of the support foot via the knee joint mechanism.

Prior art

A brake or support foot of the kind in question is known from US Patent No. 2,712,366. Also, US Patent No. 3,554,328 relates to a brake or support foot of a type with a built-in return spring, in this case without a knee joint mechanism. In both cases, these are structures whose clearance height under the conveying device under which they are mounted is of the order of 200 mm or more. The design of the guide, release and spring mechanisms of the units does not allow for a more compact structure which could result in a desired less ground clearance.

The technical problem to be solved

In general, when transporting trucks or trains of several types of carriage-like containers and actual transport vehicles with their own wheels, it is a problem to have these transport units slowed down and / or secured in such a way that the units do not move during transport. For this purpose retractable brake support feet of the described type are used, which are activated when the transport units are rolled into place in the truck or freight car. In activated position, the transport unit's own wheels are thereby lifted free from the ground, and the unit rests on the friction-stable shoe of the brake support foot or the friction feet.

However, known brake support feet of the kind in question have a ground clearance (recess height) which in many cases substantially exceeds the ground clearance of the wheels, and therefore the containers or transport vehicles must be arranged with an unnecessarily high bottom surface. This obviously goes beyond the load capacity. For modern container types (and, moreover, for many other wheel mounting type transport devices), brake support feet with a clearance height or recessed height of about 140 mm and a braking range (brcmschøjdc) of about 40 mm are needed today. The present invention aims to meet this desire.

The new technique

The new feature of the invention consists in the fact that the upper and lower parts of the support foot are in the main, consisting of two consecutive telescoping profile tubes arranged with a tension spring inserted between the inner tubes thereof, which tension spring is adapted to actuate the slidable lower 2 DK 96 00130 U3 profile tube piece with a spring force directed upwards relative to the upper fixed profile tube piece, so that the extension of the support foot can be caused by this spring force alone.

Further, the provision consists in that said knee joint mechanism is external to the profile tubes with one knee joint mounted around a joint point at the top of the fixed profile tubular piece, and the other knee joint mounted around a joint point at the bottom of the displaceable profile tubular joint, and thus two knee joint pieces are interconnected in a common joint point approximately midway between the upper and lower joint points such that the knee joint pieces pass a center position where the three joint points are aligned as the support foot changes position from the retracted (braked) position to the retracted position and vice versa, the knee joint mechanism in combination with the mentioned internal tension spring achieves the bistable holding function.

The technical impact

By using the aforementioned new technique in conjunction with the prior art, the brake support foot can be built more compactly, thereby reducing the installation height to about 140 mm while maintaining the braking range (braking interval) of about 40 mm. In particular, the reduced build length is achieved by the indicated placement of the tension spring inside the two telescoping profile tubes, while the knot mechanism and release pawl are positioned exterior to the tubes, thus saving construction length. Preferred embodiments are set forth in subclaims 2 to 9.

The invention and particularly advantageous embodiments and details thereof are explained in more detail below with reference to the figures in the drawing.

List of Figures

FIG. 1 shows a retractable brake or support foot according to the invention, seen from the side in activated braking position (lowered position); FIG. Figure 2 is the same shown in a middle dead center position where the support foot's knee joint mechanism is released by actuation of the release pawl; 3 shows the brake / support foot shown in the upright position, and FIG. 4 brake / support foot shown in vertical section through the centerline of the profile tubes. Embodiment Examples In the embodiment shown in FIG. 1-3, the support foot consists essentially of a top profile tube 1, a lower profile tube 2, a knee joint mechanism 3 with brake actuating pedal 4 and release pallet 5. Inserted into this profile tube piece 1 and 2 FIG. 4th

For example, the two profile tubes 1 and 2 may have a square profile so that the tubes are rotatable relative to each other. The upper pipe piece is welded to a mounting plate 7, which is provided with bolt holes not shown. Correspondingly, the lower pipe piece 2 is provided at its lower free end with a welded foot plate 8, on the underside of which is mounted a friction-increasing and vibration-damping coating or sole 9.

Claims (9)

1. Retractable brake or support foot, in particular for a trolley, postal container or similar transport wheeled vehicle, and more particularly of the type in which the support foot comprises a top part (1,7) fixedly mounted on the underside of the transport device and a in the upper part of a spring device (6) retractable lower part (2), which at its lower end is provided with a frictionally stable brake shoe (machine shoe 8,9) for repulsion against the ground and where for activation - DK 96 00130 U3, i.e., retraction of the support foot, there is a knee joint mechanism (3) with bistable holding function, which can be operated with the foot via a pedal (4), characterized in that - the upper and lower part of the support foot are essentially two telescoping profiled tubing (1, 2) provided with a tension spring (6) inserted between the tubes inside thereof, said tensioning spring adapted to actuate the slidable lower profile tubular piece (2) with a spring a force directed upwards relative to the upper fixed profile tube piece (1), such that. the pull-out of the support foot can be caused by this spring force alone, and - said knee joint mechanism (3) is exterior to the profile tubes (1,2) with one knee joint (10) mounted around a joint point (12) at the top of the fixed profile tubular piece (1) and the second knee joint (11) mounted around a joint point (13) at the bottom of the displaceable profile tube piece (2) and so that the two knee joint pieces (10,11) are interconnected in a common joint point (15) approximately in the middle between the upper and lower joint points such that the knee joint pieces (10,11) pass the middle position, where the three joint points (12,13,15) are aligned when the support foot changes position from the pulled down (braked) to the pulled position and vice versa, whereby the knee joint mechanism in combination with the said internal tension spring (6), the bistable holding function achieves. Retractable brake or support foot according to claim 1, characterized in that the support foot includes a release pawl (5), which is mounted independently of the knee joint mechanism (3) and which acts at lateral pressure on the upper link piece (10) of the knee joint mechanism (10). actuation of the release pawl causes the knee joint to be forced to pass the said dead center position (center position) towards the position where the support foot is pulled up. Retractable brake or support foot according to claim log2, characterized in that the knee joint mechanism is a symmetrical double joint structure with a uniformly formed knee joint set (3) arranged symmetrically on each side of the profile tubes (1,2) and the knee joints on the two sides are interconnected. by a hanger-shaped brake actuation pedal (4) which is welded or bolted to the two lower legs of the knee joint 11. Retractable brake or support foot according to claims 1-3, characterized in that the release pawl (5) is also of a hoop shape and is mounted about the same two joint points (12) as the two upper knee joint pieces and the release pawl is located frontally on the support foot of the same side as the brake actuating pedal (4) and substantially within its extent so that the pawl can be moved (activated) independently of the brake pedal and vice versa. Retractable brake or support foot according to claim 4, characterized in that the release pawl has two protruding abutment faces (5b) which act directly against the two upper knee joints (10), so that a push on the pawle forces the knee joint mechanism over said dead point position, and that the trigger pallet is provided with its own return spring. Retractable brake or support foot according to claim 1, characterized in that the upper profile pipe piece is welded to a horizontal mounting plate (7), which is provided with bolt holes and that the lower profile pipe piece is provided with a foot plate (8) on which the underside of which is fitted with a brake-increasing friction coating (9) or a coating whose purpose is vibration damping. Retractable brake or support foot according to claim 3, 4 or 5, characterized in that the upper and lower articulation points (12,13) of the knee joint pieces consist of two nails (12a, 13a) which are passed on DK 96 00130 U3 across through which cross-bores are formed in the profile tubes (1,2), and which nails inside the profile tubes form brackets for the tension spring (6), whose pulling eyes (6a) enclose the nails. A retractable brake or support foot according to claim 7, characterized in that the nails (12a, 13a) are located centrally in the symmetry center line of the profile tubes (14). Retractable brake or support foot according to claim 7 or 8, characterized in that the nails are made of pipe pieces which are extruded or otherwise pulled out after mounting of the respective knee joint pieces and other parts included in the mechanism.